How to switch to "Use Git from command prompt?"
If you're asking how to use Git on the default Windows CMD, I'd just update your PATH environment variable. It's literally all that does (In my case at least). Find the git executable and append it to the end of your PATH.
If I'm wrong, feel free to correct me, I haven't used Windows in a few months (Thanks Arch Linux).
Another thing I should mention: Should your question be on a different website? This is a programmer questions website.